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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eef854d1ccbe92204f3c2f2dac01103e7bd7c8d9dcf0632d7067c1ab71c7fe4d' 
  AND token = '38fBh1EAAmvuI8wnnWUdJ4hHLQbJxZd9vi52ofhzP+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}